I started having problems logging in at Yahoo, Amazon, and a few forums I visit. On all but Amazon I can log in as long as I don't check the remember me box. If I check the remember me box I get a message saying cookies are not enabled even though they are. I can't log in to Amazon at all with IE but I can with Chrome. I cannot change the Safe Search setting in Bing either. This made me think IE was the problem but resetting with Microsoft's fix it tool didn't help and neither did manually setting the option's to allow these websites. Changed from IE9 to IE10 and it still won't work. No matter what I change in internet options it doesn't make a difference and Safe Search refuses to change at all.
I'm running Windows 7 64 bit with McAfee protecting it and scanning weekly. Run CCleaner weekly. Monthly scans with Malwarebytes & Superantispyware.
Is my issue with Windows 7 or IE? What else can I try before I give up and re do the system with the factory Dell disk's?